FWIW, I do think Cadel was relatively clean The key word is of course relative.
There was a very good analysis done of the TdF riders called "Not Normal".
Cannot find it on line at the moment and can't find where I downloaded it a few years back, but I do remember that for the most part Cadel's performance was at the high end of normal with a couple of suspect rides (rides that might have been humanly possible but could have also been chemically assisted).
The analysis clearly has limitations but, it appeared to correlate pretty closely to what we have subsequently found out about various riders
Was he double fisting EPO and Testo like many of his contemporaries at the time - it would appear not. Did he ride totally on bread and water - nah - even in 2011, which, at a whisker under 40 clicks was a somewhat slow race, to be up the front at the end, not only do you need a strong team to support you, you also need a little help from time to time.
High end of normal, eh? That sounds suspicious.